There isn't 100% reliable evidence that global warming due to CO2 is happening, but it has been proven that average temperatures have been on the rise in the last century and that CO2 is a heat-trapping gas. So naturally it makes sense not to release too much CO2 into the atmosphere and it makes sense to drive fuel-efficient cars.

About the emissions, I'm surprised that gasoline engines emit more PM1 particulates than diesels. If that's really the case, then gasoline engines are even worse than I thought.

__________________
2004 VW Jetta TDI (manual)

Past MB's: '96 E300D, '83 240D, '82 300D, '87 300D, '87 420SEL